Stellar Parallax and Distance Measurement

The video explains how astronomers use stellar parallax to measure star distances, limited to about 300 light-years due to narrow angles and atmospheric interference. To overcome this, satellites like Hipparchus and Gaia were launched, extending measurement capabilities to 32,000 light-years. For objects beyond this range, astronomers use the brightness of stars and the inverse square law to estimate distances. Despite multiple methods, stellar parallax remains the most accurate and reliable technique.

What is the primary method astronomers use to measure the distance to stars?

• Spectroscopy

• Gravitational lensing

• Redshift

• Stellar parallax

What geometric shape is formed when measuring stellar parallax?

• Circle

• Square

• Triangle

• Rectangle

What is the maximum distance stellar parallax can measure from Earth?

• 1,000 light-years

• 300 light-years

• 100 light-years

• 10,000 light-years

Which satellite was launched by ESA in 1989 to measure stellar positions?

• Kepler

• Hipparchus

• Hubble

• Gaia

What is the mission of the Gaia satellite?

• To explore Mars

• To measure the distance of stars up to 32,000 light-years

• To observe the Sun

• To study black holes

How accurate is Gaia in measuring distances up to 32,000 light-years?

• 70%

• 90%

• 100%

• 50%

What rule is used to estimate distances beyond 32,000 light-years?

• Newton's law

• Inverse square law

• Kepler's law

• Einstein's theory

How does the brightness of a star relate to its distance?

• Exponentially proportional

• Unrelated

• Inversely proportional to the square of the distance

• Directly proportional

Why is stellar parallax still considered the 'golden method'?

• It's the cheapest method

• It's the easiest to perform

• It's the most accurate and reliable

• It's the oldest method

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